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#92728 04/05/05 09:27 AM
Joined: Nov 2001
Posts: 75
B
Bill39 Offline OP
Member
I need to figure the proper conduit size for a group of communication cables. These are 3 diffent size cables and I have the OD of each. There will be a mixture of each in several conduits.

Where in the NEC (or elsewhere)do I find this? In the old codebooks I thought there were examples but I'm having trouble finding it in the new one.

Thanks in advance for your replies.

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Joined: Jan 2004
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G
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I'm looking at Chapter 9 Notes to Table 1 note #5 and I would calculate the area of your cables and abide by the percentages in Table 1.

Another item: Note #9 might impact on your measurements.

[This message has been edited by George Little (edited 04-05-2005).]


George Little
Joined: Mar 2003
Posts: 849
Y
Member
ODxODx.7854 = sq. inch of cables.

Example Cad 5 =.215OD
.215 X .215 X .7854 = .0363051

#12 THHN OD = .111
.111 X .111 X .7854 = 0096769

When you got a mixture of Cables and only know ID use this then go to conduit fill charts.


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